Is there an accepted reference Standard for the maximum permissible residual magnetism existing at the ends of gas pipes, or similar, prior to welding, which will not effect the welding procedure, eg arc deflection, blowout.
04:14 May-25-2002 Re: Resdidual magnetism in pipes : Is there an accepted reference Standard for the maximum permissible residual magnetism existing at the ends of gas pipes, or similar, prior to welding, which will not effect the welding procedure, eg arc deflection, blowout. . : Replies will be appreciated : Bruce Owen .
While I was working in Canada Nova Pipelines had an excellant procedure developed which had max. allowable and methods to remove the magnetism using cable wraps etc.
This came in to play quite often as the right of way we were constructing along ran North South with the added benefit of a power transmission line along to the left.
I would suggest you contact someone from the visual department of Canspec testing ( www.canspec.com ) or RTD www.rtdqualty.com, they may be able to pull out the details or put you onto someone who can.
I cannot recall seeing residual magnetism specified in the canadian or american pipeline standards, most often it was an in-house procedure.
08:06 Dec-20-2018 Re: Resdidual magnetism in pipesIn Reply to Bruce Owen at 03:08 May-25-2002 (Opening).
Yes, API-5L, 46 edition, ANNEX E, clause E.7.6 is directly concerned with this. It states that 4 readings shall be taken on the circumference of the pipe 90 degrees apart. The average of four resdings shall be less than or equal to 30 gauss, and no individual reading shall exceed 35 gauss.
The Cygnus 6+ PRO thickness gauge is the most advance gauge within
the Cygnus range with key featu
res including: comprehensive data
logging; A-scan and B-scan display; manual gain control; Bluetooth
connectivity; and much more. With its unique dual display and three
measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this
surface thickness gauge offers maximum versatility for inspections.
SIUI’s newly launched Smartor is a combination of ultrasonic testing
and ultrasonic thickness me
●Compact size: 198 (W)* 128 (H) *520 (D) mm
●0.9kg only with battery
●5.7" LCD with high resolution 640×480 pixels
●Multiple conventional UT functions
●Smart Test Wizard